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Re: fuse blows on heat/ac
Start with the obvious... you have a short circuit... i presume the fuse you have to keep replacing controls the fan. look under the dash near the fan and look for the resister block that controls the fan... you won't see the actual resisters but you will see wires that plug into the side of the duct work for the vents.... remove the two screws holding that block in and check the condition of the resister block. while you have the part out and unplugged you can easily test if the short is there by putting to fuse back in and seeing if it blows again.
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The fuse is used by the following :
3. Trip computer.
4. Stop Lights.
7. Instrument cluster.
8. Front heater and A/C.
Any of the components could be the cause of it. Note if the fuse blows when any component relaed to it is operated, such as blower fan, applying the brakes.
PCM and trip computer would be less likely to be the cause as they uses minimal current.
Try this first. Replace the fuse. Make sure the AC & Heaters are OFF. Start your vehicle and sit there with the car running. Turn on the heater on full blast and wait. Tolerate the heat. If the fuse blows again, you have a problem with your heater circuit (fan or heater switch). If it does not blow, turn the heat off then turn on the air conditioner full blast. Tolerate the cold. If the fuse blows your problem is with the AC circuitry. If nothing blows. Turn off the heat and the air conditioning. Step on the brakes and hold it down for about 10 minutes. If the fuse pops then you have a problem with your brake light circuit (brake light bulbs may be shorted, your brake light switch may be bad, etc.). These are the easy checks. After that you need to take your vehicle into a shop that can troubleshoot electrical problems. Sorry, but that is about all you can do at this point. They will be able to tell you exactly where the problem is. However, you need to take it to a place that is experienced in troubleshooting car electronics.
There is a relay that powers the blower motor circuit . Left I/P fuse box , do you know where that is ? The relay is IGN 3 relay .
Fuse Block- I/P - Left
LF of the passenger compartment, behind the kick panel
IGN 3 RELAY
IGN3, HVAC CNTRL MODULE
HVAC CNTRL MODULE, TC SW., HTD SEAT SW.
Does your car have Manual or automatic climate control ?
Look under the hood and unplug the blower motor. Then replace the fuse. It should not blow the fuse without the blower connected. If the fuse blows again there is a short before the blower motor. There are several Black power boxes, usually under the hood on the Drivers side, the A/C relay may be burned out.
If the fuse does not burn out, replace the Blower motor. You can get one from a Salvage yard or Autoparts place. If you still have problems and the Climate Control panel is lite, there is a self-diagnostic feature which is run by pushing some of the control buttons in a particular sequence.
The codes for this sequence is different from the Master computer.
It may also reveal problems only a Technician can fix. So try the Blower motor first, A/C relay second, and hopefully this will get you going.
YOU HAVE TWO SEPERATE FANS TO BLOW THE AIR ONE IN FRONT AND ONE IN THE BACK CHECK THE FUSES FIRST UNDER THE DASH AND SECOND UNDER THE HOOD SHOULD BE ANOTHER ALSO CHECK THE RELAYS UNDER THE HOOD THE PUSE PANEL COVER SHOULD TELL YOU THE FUSE LOCATION AND NUMBER AND AMPERAGE OF THE FUSE
sounds like a connection at or a bad front blower motor. it's mounted under the hood on the passenger side fire wall. it should have 1 plug going into a rubber like connector. thats your power wire and another going to ground.i think back in 2001 the power wire was purple in color.
good luck chris